Feeding mechanism for drilling machinery



Feb. 26, .1929. 1,703,791

A. M. SOSA ET AL FEEDING MECHANISM FOR DRILLfNG MACHINERY Filed June 13, 1927 3 Sheets-Sheet l Feb. 26, 1929. 1,703,791

A. M. 505A U AL FEEDING MECHANISM FOR DRILLING MACHINERY Filed June 13. 1927 3 Sheets-Sheet 2 H 34| I l r 33 1 1" 32 3 O 09 I I4 44 O l 0 K E o as 1! M; F 25 m 5 w I 1 '15 H mi" l l 14 5 I4 I M f II i 1 I06 64 O 88 5 l as: 85

Feb. 26, 1929. 1,703,791

A. M. 505A ET AL FEEDING KECHANISM FOR DRILLING MACHINERY Filed June 13, 1927 C5 SheeCs-Sheet 3 Iig 7..

Patented 26, 1929.

UNITED "s,'rAT -Es PATENT OFFICE.

nueus'ros n. sosa, or cmcnma'rx, mm wmmn G. aomscmm, or 'xonwoon, 01110, ASSIGNORS TO THE ummcm TOOL wonxs oonamr, or cmcnmm'l,

OHIO, A CORPORATION OI OHIO.

FEEDING HECHANISH FOB DRILLING-CHERRY.

hpplication filed June 1a, 1921. Serial no. "name.

It is the object of our invention to provide novel means for quick release in the power feeding train for insuring a definite moment of release for accuracy in the depth of cut of the cutting tool on the drill-spindle; further, to provide novel means whereby the urge for release relation 1n the power feed is increased with increase in the power necessary to perform the feeding operation; further, to provide novel means for lim ting the movement of the drill-spindle in feeding direction; further, to provide noyel means for manual feeding of the drill-s 1ndle; and, further, to provide novel sa ety means to prevent interference between the power feeding devices and the manual feeding devices, and the invention Wlll be further readily understood from the following description and claims, and from the drawings, in which latter: t

Fig. 1 is a front elevation of a drill-head mounted on a, drill-arm, partly broken away.

Fig. 2 is a side elevat on of the same.

Fig. 3 is a vertical section of the same, taken 011 the irregular line 33 of Flg. 2.

Fig. 4 is a vertical section of the same,- taken in the plane of the irregular l1ne 4-4 of Fig. 3.

Fig. 5' is a horizontal cross-section of the same, taken in the plane of the irregular line 5-5 of Fig. 3, and partly broken away.

Fig. 6 is a horizontal cross-section, taken in the plane of the line 6-6 of Fig. 4, and partly broken away.

Fig. 7 is a horizontal section, taken in the plane of the irregular line 77 of Fig. 4.

Fig. 8 is a vertical cross-section, taken in the plane of the line 88 of Flg. 4; and,

Fig. 9 is a detail view of the operating arm, partly in section on the line 99 of Fig. 1.

A usual drill-arm 21 supports a usual drill-head 22 adjustable laterally on the drillarm, as by means ofa handle 23 in train with a usual rack-pinion meshing with a usual rack 24 extending lengthwise of and secured .to the drill-arm. The drill-arm may be the usual drill-arm of a usual drilling machine or of a so-called sensitive radial drilling machine. A drill-spindle 25, arranged for carrying a usual drilling tool 1n its lower end, is rotatable and slidable axially in the drill-head.

a suitable belt suitably driven. spindle has spline key and groove connec- In the present exemplification there is a sleeve 31 journaled in bearings 32 in the drill-head, the, sleeve having a pulley 33 thereabout and secured thereto, so as to 1'0- tate the sleeve, the pulley being rotated b the rack, sleeve and the drill-spindle endwise.

The sleeve 31 has a pinion 43 fixed thereto, which meshes with a gear 44 fixed to a shaft 45 journaled in bearings 46 in the drill-head. A cluster gear 47, shown as comprising three gears, is shiftable axially on the shaft 45, and rotates with said shaft,

as by suitable spline groove and key connection 48. The respective gears thereon are arranged to mesh with the respective gears, shown as three in number, on a gear cluster 51, fixed to a shaft 52, journaled in bearings 53, in the drill-head.

The gear cluster 47 is adjustable axially on its shaft by means of a handle 56 on a.

shaft 57 journaled in a bearing 58 in the drill-head. The shaft 57 has a pinion 59 thereon which meshes with a rack 60 of a rack-piece 61 having a fork 62 thereon, which is received in an annular groove 63 in the gear cluster 47. able axially on a rod 64 secured in bearings 65 in the drill-head. The rod 64 is provided with annular grooves 66, in which a s ringpressed positioning ball 67 is arrange to be respectively received for locatin the gear cluster 47 in adjusted positions. The ball is received in one of said grooves at each intermeshing relation of the gear clusters and at an idle position of the gear cluster 47. When said ball is received in the second groove from the top, the gear-cluster 47 is in idle position, for leaving the train of gears beyond said gear-cluster idle.

The shaft 52 has a worm 71 rigid therewith, which meshes with a worm-wheel 72, rotatable loosely on a shaft 73 fixed in bear- The dril The rack-piece is movings 74, 75, in the drill-head. A gear 77 is arranged to be operatively connected with and disconnected from the worm-wheel, as b means of a clutch 78, shown as a tooth cliitch, the teeth of which are respectively on the worm-wheel and on a clutch-collar 79. The clutch-collar and the gear 77 are fixed together, as by being an inte ral piece slidable axially on' the hub 80 of the wormwheel and rotating normally loosely on said hub. The clutch-collar and the gear 7-7 are arranged to be moved axially on said hub for engagement of the clutch when it is desired to feed the drill-spindle by power, or for disengagement of the clutch when a power feed is not desired.

A gear 81 meshes with the gear 77 and is rotatable on a stud fixed to the drill-head. The gear 81 meshes with a gear 83 fixed to a shaft 84, journaled in bearings 85 on the drill-head. The shaft 84 has a bevel-gear 86 fixed thereto which meshes with a bevelgear 87, the hub of which carries the rackpinion 39, and is fixed to a feed-shaft 88 ournaled in bearings 89, 90, in the drillhead. The rack-pinion meshes with the rack 38 on the sleeve of the drill-spindle.

An operating arm 91 is fixed to a rockshaft 92, rockable in bearings 93 in the drillhead. A fork '94 is fixed to said rock-shaft. The arm 91, rock-shaft 92 and fork 94 form an operating lever for the clutch 78. A shoe 95 is pivoted to the fork on pins 96, the shoe bein received in an annular groove 97 in the clutc -collar. The operating arm 91 is arranged for manually engaging and disengaging the clutch. An arm 98 extends from the fork for automatically disengaging the clutch.

A projection 101 extends upwardly from the rack-sleeve 35, and is provided with a laterally extending lug 102, which projects into range with a projection 103 on the clutch-arm 98, for operating said clutchlever and thereby releasin the clutch. The

rojection 103 is guided in a slot 104 in a Eracket in the drill-head. A counterweight 106 is guided by a rod 107 fixed in the drillhead, the rod being received in a hole in the counterweight. The counterweight has one end of a flexible band 108 secured thereto, the flexible band being received about a pulle 109 journaled on a stud fixed in the drillead, the other end of said flexible band being secured to the upper end of the upward projection 101.

The lug 102 is arranged -to strike the projection 103 of the clutch-lever when the drills indle has been moved to fullest extent in ownward or outward direction, to move said clutch-lever so as to disengage the clutch and to serve as a limiting stop for axial movement of the drill-spindle.

Means are rovided for selectively stopping the fee ing movement of the drillspindle and for positively arresting such feedin movement. Thus an arm 111 extends rom the fork 94 and has on it a hook 112, which is arranged to coact with a stationariy pin 113 fixed in the drill-head. A cam-p ate 115 is releasably and adjustably secured to the shaft 88 of the feed-pinion 39, as by having a securing plate 116 fixed to said shaft, which late has a circular groove 117 therein. 11 outer index-plate 118 and the cam-plate 115 are journaled about the hub 119 of the plate 116. The groove 117 is shown as a dove-tailed groove having the dove-tail heads respectively of a positionin pin 120 and a clamp-bolt 121 received t erein, the positioning pin and clamp-bolt being received through the camplate 115 and in the index-plate 118, the bolt being received through said index-plate and having a clamp-nut 122 thereon for clamping the securin plate 116, the camplate 115 and the in ex-plate 118 together in adjusted positions.

The cam-plate is provided with a cam face 125 which is arranged to engage the arm 111 for disengaging the clutch when the cam-- plate is clamped to rotate with the feed pinion 39.

The index-plate 118 has graduations 126 thereon, which register with a pointer 127 on the front of the drill-head. In setting the cam-plate, the index-plate and the camplate are unclamped and rotated together about the axis of the feed pinion 39 until the graduation mark on the index which equals the depth of hole it is desired to drill is positioned in registry with the pointer 127, the drill-spindle having been previously fed downwardly so that the point of the drill engages the top face of the work in which the hole is to be drilled. WVhen now the plates 118, 115 and 116 are clamped together, and the drill is operated and fed into the work, the drill will be at its desired limit of feeding movement for drilling a hole of the desired depth when the zero mark on the index coincides with the stationary pointer, at which point the tripping of the clutch takes place.

When such tripping takes place, the hook 112 engages the pin 113 and a lug 128 on the cam-plate engages the end of the hook, for

definitely stop ing the rotation of the feedtion of the clutch the end of the plun er is received in a slot 135 on said lug for olding the clutch in properly en aged relation.

The combined clutch collar 9 and ear 77 rotate loosely and move axially on the hub 80. The gears 77, 81, have meshing teeth which are inclined with relation to their axes, these teeth being helical teeth. The inclinations of the teeth are'in such direction as to aid in release of the clutch and normally urge release of the clutch during power feeding of the drill. In the present instance the gear 77 rotates counter-clockwise, as indicated by the arrow in Fig. 5, and the teeth are arranged along right hand helices. This construction provides a very sensitive and definite release in the power driving means for feeding the drill, in order that a definite moment of release of the feeding movement of the drill may be provided. In this construction the impulse for release of the clutch increases with increase in pressure necessary between the teeth of the gears for feeding the drill, so that the greater the feeding pressure that is required, the greater will be the urge for release of the clutch. The combined gear and clutch also rotate loosely about the hub so that there is no lateral friction between these parts.

Our improved device provides very sensitive and accurate releasing means for feeding the drill.

The adjustable step may be employed when feeding the drill manually, in which case, however, the clutch 78-remains in release relation, and the hook 112 remains in engagement with the pin 113, the stop face 128 engaging the lower end of the hook at the desired limit of feeding movement of the drill-spindle.

If no adjustable stop for feeding move- 'nient of the drill-spindle by power or by hand is desired, the nut 122 is'releas ed, which releases the cam-plate 115 and the indexplate 118 from the securing plate 116, and permits free rotation of the feed-pinion 39, throughout the range of feeding movement of the drill-spindle.

The shaft 84 is provided with a handwheel 141, shown as a pilot-wheel, by means of which the drill-spindle may be raised and lowered rapidly when the clutch 78 is disengaged, for raising the drill-spindle out of the work, or to upward position, or for causing rapid descent of the drill-spindle, for instance, for contact of the end of the drill with the work.

The manual feeding movement of the drill-spindle for feeding the drill into the work is preferably accomplished by means of an arm 142, which has a plunger 143 movable in a socket 144 in the arm. The plunger is provided with a tooth arranged to engage between the teeth of a notch-plate 145, which is keyed to the shaft 84. A spring 146 in said socket normally urges engagement of the plunger with the notchplate for connecting the arm 142 with the shaft 84. The manual feeding of the-drill into the work may be accom lished by one or more feeding movements oi the operating arm 142, depending on the depth of hole to be drilled or other operation to be performed, the operating arm being released from the notch-plate during return movements of the lever-arm toinitial positions. Release from the notch-plate is automatically accomplished when the operating arm 142 is returned to normal position, as by means of a release lever 150, pivoted on a pin 151 in the arm, and having a link 152 which is articulated with the release lever at 153 and is received through a slot 154 in the operating arm, and connected with the plunger 143 as by a pin 155 for moving the plunger away from the notch-plate. I

The release lever 150 is provided with a shoe 156 which has a notch 157 therein. A pin 158 is fixed to the drill-head. Upon return of the operating arm 142 to initial position, the shoe is received under the pin and thereby automatically shifted for automatically releasing the plunger 143 from the notch-plate 145, the plunger being held in release position by reception of the notch 157 about the releasing pin 158, which also holds the operating arm 142 in retracted position.

Our improved construction provides great power for hand feeding of the drill, and insures a release of the hand lever from the power driving means for the drill-feed, when it is desired to use the power feed for the drill-spindle.

Our improved device further provides very sensitive and accurate adjustable release of power feed from the drill-spindle for accuracy in len ths of feeding movements of the drill-spindle, and provides releasing means in which the urge for release is increased as the feeding resistance is increased for accuracy and speed of release of feeding movement.

Our improved device further automaticall releases the operating-arm for manual fee upon retraction of said operating arm and enables the change from hand feeding to power feedin or vice versa, to be accomplished by t e movement of a single control part, namely, the operating arm 91, whereby the change from power feeding to hand feeding, or vice versa, is instantly obtained.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is:

1. In a drilling machine, the combination with a rotatable and axially feed able drillspindle, of a train of gearing for axially feeding said drill-spindle, power means for driving said train of gearing, said train of gearin including relatively releasable driving cements and a pair of meshing helical gears, one of said releasable driving elements and one of said helical gears connected for combined movements in releasing direction, the helical teeth of one of said helical gears movable along the helical teeth of the other of said helical gears, and the helices of said helical teeth being inclined to urge said connected helical gear and said one, of said releasable driving elements in release direction, means whereby to maintain said relatively releasable driving elements in driving relation, and means feedable with the feeding movement of the drill-spindle acting on said maintaining means to place said maintaining means in release relation.

2. In a drilling machine, the combination with a rotatable and axially feedable drillspindle, of a train of gearing for axially feeding said drill-spindle, power means for driving said train of gearing, said train of gearing including a clutch and a pair of meshing helical gears, said clutch including a clutch-member and a complemental clutchmember, said first-named clutch-member and one of said helical gears connected for combined axial movements, the helical teeth of one of said helical gears movable axially along the helical teeth of the other of said helical gears, and the helices of said helical teeth being inclined to urge said connected helical gear and clutch-member axially away from said complemental clutch-member while rotative force in feeding direction is applied to said gears, thereby urging release of said clutch, clutch operating means, and a complemental tripping part for said clutch operating means, said complemental tripping part having operative connection with said drill-spindle for movement thereof complemental to the feeding movements of said drill-spindle.

3. In a drilling machine, the combination with a rotatable and axially feedable drillspindle, of a train of gearing for axially feeding said drill-spindle, power means for driving said train of gearing, said train of gearing including relativel releasable-driving elements and a pair 0 meshing helical gears, one of said releasable driving elements and one of said helical gears connected for combined movements in releasin r direction, the helical teeth of one of said he ical gears movable along the helical teeth of the other of said helical gears, and the helices of said helical teeth being inclmed to urge said connected helical gear and said one of said releasable driving elements in release direction, an o crating arm, releasable connecting means etween said operating arm and said train of gearing for manually feeding said drill-spindle, and automatic releasing means for said connectng means operable to release said connectmg means upon retracted position of said operatlng arm.

4. In a drilling machine, the combination with a rotatable and axially feedable drillspindle, of a train of gearing for axially feeding said drill-spindle, power means for driving said train of gearing, said train of gearing including a clutch, a pivoted arm for releasingsaid clutch, a rotatable campart provided with a cam angularly adjustable about its axis of rotation, said cam rotatable in feeding relation with said drillspindle, said cam coacting with said arm for releasing said clutch, and a stop for said arm between said cam and the pivot of said arm, said stop arresting movement of said arm toward said pivot, and said cam provided with a stop coacting with said arm in similar direction for definitely stopping feeding movement of said drill-spindle.

In testimony whereof, we have hereunto signed our names.

AUGUSTUS M. SOSA. WILLIAM G. HOELSCHER. 

